1. Switch your camera to manual mode.
2. Use a shutter speed of 1″ to start with.
3. Set the camera on a tripod.
4. Use the self-timer. Make sure you cover the eye piece.
5. If the lights aren’t bright enough, try a slower shutter speed. If the lights are too bright, try a quicker shutter speed.
Western Washington University: exposure time-3 seconds
*Information from www.dslrtips.com